Door-operating mechanism



(No Model.) 2 Sheets-Sheet 1.

A. DITTMA R. DOOR OPERATING MECHANISM.

Patented May 10, 1898;

lllllllllll STATES AUGUST DITTMAR, OF LAWRENCE, OHIO.

DOOR-OPERATING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 603,895, dated May 10,1898. Application filed December 16, 1897- Serial No. 6 62,105. (Nomodel.)

To all whom it may concern:

Be it known that I, AUGUST DITTMAR, a citizen of the United States,residing at North Lawrence, in the county of Stark and State of Ohio,have invented a new and useful Door- Operating Mechanism, of which thefollowing is a specification.

My invention relates to improved mechanism for operating minedoors,being particularly applicable to sliding doors; and it has for itsobject the production of simple mechanism which may be automaticallyoperated by a car passing into or out of the mine.

The invention will first be described with reference to the accompanyingdrawings and then pointed out in the claims.

Figure 1 of the drawings is a perspective view illustrating theapplication of my invention, the doors being shown closed. Fig. 2 is aview in elevation of the same, showing a car in proper relative positionand the doors open. Fig. 3 is a plan view of the same, the doors beingclosed. Fig. 4 is a detail illustrating the manner of accommodating therock-shaft to a curved track. Fig. 5 is a view in e1eva-. tion of therock-shaft bearing, the shaft being in section. Fig. 6 is a perspectiveview of the coupling-box for the rock-shaft. Fig. '7 is a sectional viewof the same, showing the weight-lever in place to illustrate itsadjusting feature.

Referring to the drawings, A represents the rails of a track leadinginto the mine, secured to ties 1, and B the doors, preferably mounted toslide upon hangers 2, the doors being mounted in the usual framework,comprising sills 3, uprights 4, and cross-pieces 5, all as shown.

Alongside one rail A, I locate a rectangular operating-bar 6, set onedge, as shown, the bar normally projecting above the tread of the railand being of sufficient length to ex-- tend a suitable distance on eachside of the doors.

O represent-s a rock-shaft mounted in bearings c, hereinafter described,it being preferably square in cross-section and adapted to rock on edge.The bearings c are conveniently secured upon the ties 1, as shown, andcomprise a base-plate 7, having an obtuse-angled depression 8 therein,and a cap 9 for the base-plate, having an upwardly-extending recess 10,adapted to receivethe upper portion of the rock-shaft, the portion ofthis recess that contacts with the edge of the rock-shaft being cut onan are similar to the are formed by the upper edge of the shaft inmovement, thus holding the rock-shaft in place and yet permitting thenecessary rocking movement, all as clearly shown in Fig. 5. Therock-shaft is preferably formed in three .or more lengths tion to thebox through slots 15, formed in the lever and through which the screws14 pass, all as clearly shown in Fig. 7. Weights 16 are adjustablysecured on the ends of lovers D by set-screws 17.

E represents an angle-lever secured on the rock-shaft close to the doorsB, the inner end of this lever being secured to the operatingbar 6,while its outer end is secured to the short arm of a lever18 bya link19, the lever 18 being pivoted in a standard 20, secured in thedoor-frame. The long arm of lever 18 is connected to one door B by alink 21, the extreme end of the lever being pivoted to one end of a rod22, the other end of which rod is connected to the longer arm of another1ever 23, pivoted to a standard 24, rising on the opposite side of thedoor-frame, the lower end of lever 23 being connected to the other doorB by a link 25. The upper portion of lever 23 is bent, as shown, toavoid obstructing the passage-way through the doors when the lat-.

ter are open.

By forming the weight-levers D with slots 15, through which the screws14 pass for se curing the plates of the coupling-boxes together, I amenabled to adapt the mechanism for a track having a curve withoutbending the rock-shaft, as the slots permit the longi- IOO tudinaladjustment of the levers in the boxes, allowing the track and theoperating-bar 6 to be moved nearer to or farther from the rock shaftwithout disturbing the latter, as will be clearly seen in Fig. 4.

The operation of my invention will be clear from the above descriptiontaken inconnection with the drawings, it being seen that a car E,advancing upon the rails A, rides upon and depresses the operating bar6, which through the various lever mechanism operates *to open thedoors, the weight-levers D causing a reversal of this operation andclosing the doors when the car has passed off the bar 6.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- 1. The combination, with the'track andthe doors above the track, of a rock-shaft formed in a plurality oflengths and secured together by coupling-boxes, lever mechanismconnecting the doors and rock-shaft, means for operating the rock-shaftin one direction to open the doors, and weight-levers for operating therock-shaft in the opposite direction for closing the doors, saidweight-levers passing through the coupling-boxes and beinglongitudinally adjustable therein, as and for the purposes stated.

2. The combination, with the track and the doors above the track, of anoperating-bar alongside the track, a square rock-shaft alongside thetrack and connected to the operatingbar, bearings for the rock-shaft inwhich the latter is adapted to rock on edge, said bearings comprising abase-plate having an angular depression the meeting surfaces of whichare at a greater angle than the meeting surfaces of the rock-shaft and acap removably secured to the base-plate, the portion of said cap cominginto contact with the edge of the rock-shaft being on an are similar tothe arc of the upper edge of the rock-shaft in movement, lever mechanismconnecting the rockshaft and doors, and weight-levers secured to therock-shaft and to the operating-bar.

3. The combination, with the track and the doors above the track, of arock-shaft alongside the track, an operating-bar adjacent to one rail ofthe track, an angle-lever secured to the rock-shaft and connected atoneend to the operating-bar, a lever pivoted in the doorframe and havingits lower end connected to the angle-lever, its upper end beingconnected to one of the doors, another lever also pivoted in thedoor-frame opposite the first lever and having its lower end connectedto the remaining door, and a horizontal. bar connecting the upper endsof said levers, substantially as and for the purposes stated.

In testimony that I claim the foregoing as my own I have hereto aifixedmy signature in presence of two witnesses.

AUGUST DITTMAR.

Witnesses:

HERBERT VENABLES, DENNIS 0. Cotton.

